Binary is a number system where each number is expressed through a base-2 numeral system, there are typically only two symbols used, "0" and "1".

The numbers 1 and 0 are used to store data, a binary digit, or "bit" is the smallest unit of data in computing.

Binary is important because electronic and computer system use it as a way to represent data and perform operations, without it, it wouldn't be possible or as efficient.

To convert binary to decimal, simply look at what place value the number lands on and then add it to the total. If it is a 1, the value is true, and false if its 0. For example, if the number furthest to the right is 1, add 1 to running total (because 1 to the power of 2 is one). Then continue till you have matched all values.

The simplest way to convert a decimal number to a binary number is by dividing the given number repeatedly by 2 until you get 0 as the quotient. Then, use the remainders to write out the binary number, from bottom to top.